Stanford University
Stanford Encyclopedia of Phil.: Principia Mathematica
This site from the Stanford Encyclopedia of Philosophy briefly explains the history and significance of the famous logical treatise by Whitehead and Russell. Lists the table of contents from each of its three volumes.
Stanford University
Stanford Encycl. Of Philosophy: Alfred North Whitehead
A biography of Alfred North Whitehead. It lists major events of his life in a chronology, summarizes his philosophical influence, and provides a bibliography both of his own writings and of secondary sources about him.